I am trying to write a WLAN fingerprinting program using NativeWifi in C#. To do this i run a loop to get the wlan information many times and then later use matlab to average / analyze the data.
The problem is that i get all the same values, even as i move about the house, when the program is running. From the internet i've seen that there is a cache that stores the data of available networks. I was wondering if there is a system call which resets this cache.
I have also seen this using the cmd call
netsh wlan show networks mode=bssid
this gives me the same values until i open the available wifi networks in my OS and if i run it again after, it will give different values.
edit: This system will be for my use only, so i would be comfortable starting over on a linux platform if there is a known library that can handle this for me. I don't even know what to google to even get the information, though. Anything related to "network cache" takes me to help threads of unrelated topics...
I will provide the relevant part of my code below:
public void get_info_instance(StreamWriter file)
{
try
{
foreach (WlanClient.WlanInterface wlanIface in client.Interfaces)
{
Wlan.WlanBssEntry[] wlanBssEntries = wlanIface.GetNetworkBssList();
foreach (Wlan.WlanBssEntry network in wlanBssEntries)
{
int rss = network.rssi;
byte[] macAddr = network.dot11Bssid;
string tMac = "";
for (int i = 0; i < macAddr.Length; i++)
{
tMac += macAddr[i].ToString("x2").PadLeft(2, '0').ToUpper();
}
file.WriteLine("Found network: " + System.Text.ASCIIEncoding.ASCII.GetString(network.dot11Ssid.SSID).ToString());
file.WriteLine("Signal: " + network.linkQuality + "%");
file.WriteLine("BSS Type: " + network.dot11BssType + ".");
file.WriteLine("RSSID: " + rss.ToString());
file.WriteLine("BSSID: " + tMac);
file.WriteLine(" ");
}
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
Internally, netsh is powered by this API. What this means, is that calling netsh wlan show networks mode=bssid just returns the cache of the networks that showed up during the last scan. This is what you've discovered.
This means that in order to refresh this cache, you need to trigger a scan. If your C# library you are using includes it, you could make this happen on demand with a call to WlanScan. I am not sure which C# wrapper you are using, but it probably includes this function. When you get a scan complete notification (register with source WLAN_NOTIFICATION_SOURCE_ACM and look out for wlan_notification_acm_scan_list_refresh), the cache should be updated.
If you let me know which C# library you are using, maybe I can point you to the relevant functions.
You mentioned that opening the available networks causes the cache to refresh. This is because opening the available networks triggers a call to WlanScan.
Profiles are not relevant to the available network list -- profiles are what the Wlan service uses to keep track of which networks are configured on your machine -- deleting them does not make WlanSvc scan again. It may be a coincidence that deleting them happens to coincide with a scan, but it is more of a side effect than the designed usage.
edit: to subscribe to notifications using the Managed Wifi API you are using, this snippet should work:
wlanIface.WlanNotification += wlanIface_WlanNotification;
And the callback:
static void wlanIface_WlanNotification(Wlan.WlanNotificationData notifyData)
{
if (notifyData.notificationCode == (int)Wlan.WlanNotificationCodeAcm.ScanComplete)
{
Console.WriteLine("Scan Complete!");
}
}
You can test this by running this, then opening the available networks on Windows. You should see "Scan Complete" shortly after you open it each time. You can use a messagebox instead of Console.WriteLine if you prefer.
To trigger a scan yourself:
wlanIface.Scan();
for all
netsh wlan delete profile name=* i=*
you might not want to do it on all interfaces, and hard code the interface in there for faster result
Related
Have been working on WPF application where users current location had to be identified (it is configurable in settings = no anonymous tracking for private data). Several solutions has been tested.
Alternative number 1 - works fine on different computers, also with VPN is on. Location is tracked based on IP address and everything seems to be good. However downside of this is that it uses external sources, like third party websites for getting IP address and then read that IP address to get the location.
public string GetPublicIP()
{
String direction = string.Empty;
WebRequest request = WebRequest.Create("http://website/");
using (WebResponse response = request.GetResponse())
using (StreamReader stream = new StreamReader(response.GetResponseStream()))
{
direction = stream.ReadToEnd();
}
//Search for the ip in the html
// code here
return direction;
}
Alternative number 2 - C# Geolocator class. This works fine with additional JSON file with geolocation coordinates and location data. However on corporate computer PositionChanged event is not firing for some reason. Not sure is it blocked somehow. No exceptions, but location is not recognized due to event is not firing. On my personal computer same solution works fine (same Windows version - Windows 10). Geolocator.ReportInterval = 1000; is also not force firing event every 1 second.
private void RunGeoTracker()
{
if (Geolocator == null)
{
Geolocator = new Geolocator();
Geolocator.DesiredAccuracy = PositionAccuracy.High;
Geolocator.MovementThreshold = 100; // The units are meters.
Geolocator.ReportInterval = 1000;
Geolocator.PositionChanged += this.PositionChanged;
}
}
private async void PositionChanged(Geolocator sender, PositionChangedEventArgs args)
{
await Dispatcher.InvokeAsync(() =>
{
// code here
}
}
Are there are any alternatives, preferably without using any REST API or websites. Preferably using JSON or database for getting location data. I heard there is some PowerShell solution? Can't find examples. I mean basically Latitude and Longitude are needed. All the rest can be already achieved.
The Windows-native Geolocator API is limited by the wide variety of states a Windows laptop can be in - airplane mode, location settings disabled in common Windows settings, disabled in application-specific settings, or merely that no data providers are available to the OS (GPS satellites, WiFi triangulation, internet connectivity, OEM hardware and firmware etc.). So, any strategy to use OS-specific Geolocator API is contingent on your application (a) needing high-accuracy GPS fix, (b) involving mobility - e.g a worker driving with their open laptop in a car, or (c) ability to guide the user through UX that helps them get a location fix.
That said, do check if your Geolocator object initialization is done correctly via the steps in Microsoft's documentation - they matter!
IP geolocation has its limitations around VPN users, but it has much fewer ways of failing once you ship the software to real-world PCs and laptops. The following REST API for example will not only auto-detect the device's public IP but also respond with the approximate city-level location, including coarse latitude+longitude.
https://ep.api.getfastah.com/whereis/v1/json/auto?fastah-key=<trial_key>
The JSON response may look as follows, where the public IP is echoed back to your client application:
{
"ip": "146.75.209.1",
"isEuropeanUnion": false,
"locationData": {
"countryName": "Australia",
"countryCode": "AU",
"cityName": "Canberra",
"cityGeonamesId": 2172517,
"lat": -35.28,
"lng": 149.13,
"tz": "Australia/Sydney",
"continentCode": "OC"
}
}
The trick is to use IP location APIs that constantly update themselves as the internet and mobile landscape evolve fast.
Disclaimer: I am the developer of the above Fastah API service, so I may be a bit biased here :)
I am facing issue with perforce api (.net), as i am unable to pull sync logs in real time.
- What am I trying to do
I am trying to pull real time logs as Sync is triggered using the
Perforce.P4.Client.SyncFiles() command. Similar to the P4V GUI Logs, which update when we try to sync any files.
- What is happening now
As the output is generated only after the command is done execution its not something intended for.
Also tried looking into Perforce.P4.P4Server.RunCommand() which does provide detailed report but only after the execution of the command.
Looked into this
Reason is -
I am trying to add a status update to the Tool i am working on which shows which Perforce file is currently being sync'd.
Please advise. Thanks in Advance.
-Bharath
In the C++ client API (which is what P4V is built on), the client receives an OutputInfo callback (or OutputStat in tagged mode) for each file as it begins syncing.
Looking over the .NET documentation I think the equivalents are the P4CallBacks.InfoResultsDelegate and P4CallBacks.TaggedOutputDelegate which handle events like P4Server.InfoResultsReceived etc.
I ended up with the same issue, and I struggled quite a bit to get it to work, so I will share the solution I found:
First, you should use the P4Server class instead of the Perforce.P4.Connection. They are two classes doing more or less the same thing, but when I tried using the P4.Connection.TaggedOutputReceived events, I simply got nothing back. So instead I tried with the P4Server.TaggedOutputReceived, and there, finally, I got the TaggedOutput just like I wanted.
So, here is a small example:
P4Server p4Server = new P4Server(cwdPath); //In my case I use P4Config, so no need to set user or to login, but you can do all that with the p4Server here.
p4Server.TaggedOutputReceived += P4ServerTaggedOutputEvent;
p4Server.ErrorReceived += P4ServerErrorReceived;
bool syncSuccess=false;
try
{
P4Command syncCommand = new P4Command(p4Server, "sync", true, syncPath + "\\...");
P4CommandResult rslt = syncCommand.Run();
syncSuccess=true;
//Here you can read the content of the P4CommandResult
//But it will only be accessible when the command is finished.
}
catch (P4Exception ex) //Will be caught only when the command has failed
{
Console.WriteLine("P4Command failed: " + ex.Message);
}
And the method to handle the error messages or the taggedOutput:
private void P4ServerErrorReceived(uint cmdId, int severity, int errorNumber, string data)
{
Console.WriteLine("P4ServerErrorReceived:" + data);
}
private void P4ServerTaggedOutputEvent(uint cmdId, int ObjId, TaggedObject Obj)
{
Console.WriteLine("P4ServerTaggedOutputEvent:" + Obj["clientFile"]); //Write the synced file name.
//Note that I used this only for a 'Sync' command, for other commands, I guess there might not be any Obj["clientFile"], so you should check for that.
}
Is there any API for writing a C# program that could interface with Windows update, and use it to selectively install certain updates?
I'm thinking somewhere along the lines of storing a list in a central repository of approved updates. Then the client side applications (which would have to be installed once) would interface with Windows Update to determine what updates are available, then install the ones that are on the approved list. That way the updates are still applied automatically from a client-side perspective, but I can select which updates are being applied.
This is not my role in the company by the way, I was really just wondering if there is an API for windows update and how to use it.
Add a Reference to WUApiLib to your C# project.
using WUApiLib;
protected override void OnLoad(EventArgs e){
base.OnLoad(e);
UpdateSession uSession = new UpdateSession();
IUpdateSearcher uSearcher = uSession.CreateUpdateSearcher();
uSearcher.Online = false;
try {
ISearchResult sResult = uSearcher.Search("IsInstalled=1 And IsHidden=0");
textBox1.Text = "Found " + sResult.Updates.Count + " updates" + Environment.NewLine;
foreach (IUpdate update in sResult.Updates) {
textBox1.AppendText(update.Title + Environment.NewLine);
}
}
catch (Exception ex) {
Console.WriteLine("Something went wrong: " + ex.Message);
}
}
Given you have a form with a TextBox this will give you a list of the currently installed updates. See http://msdn.microsoft.com/en-us/library/aa387102(VS.85).aspx for more documentation.
This will, however, not allow you to find KB hotfixes which are not distributed via Windows Update.
The easiest way to do what you want is using WSUS. It's free and basically lets you setup your own local windows update server where you decide which updates are "approved" for your computers. Neither the WSUS server nor the clients need to be in a domain, though it makes it easier to configure the clients if they are. If you have different sets of machines that need different sets of updates approved, that's also supported.
Not only does this accomplish your stated goal, it saves your overall network bandwidth as well by only downloading the updates once from the WSUS server.
If in your context you're allowed to use Windows Server Update Service (WSUS), it will give you access to the Microsoft.UpdateServices.Administration Namespace.
From there, you should be able to do some nice things :)
P-L right. I tried first the Christoph Grimmer-Die method, and in some case, it was not working. I guess it was due to different version of .net or OS architecture (32 or 64 bits).
Then, to be sure that my program get always the Windows Update waiting list of each of my computer domain, I did the following :
Install a serveur with WSUS (may save some internet bandwith) : http://www.microsoft.com/en-us/download/details.aspx?displaylang=en&id=5216
Add all your workstations & servers to your WSUS server
Get SimpleImpersonation Lib to run this program with different admin right (optional)
Install only the administration console component on your dev workstation and run the following program :
It will print in the console all Windows updates with UpdateInstallationStates.Downloaded
using System;
using Microsoft.UpdateServices.Administration;
using SimpleImpersonation;
namespace MAJSRS_CalendarChecker
{
class WSUS
{
public WSUS()
{
// I use impersonation to use other logon than mine. Remove the following "using" if not needed
using (Impersonation.LogonUser("mydomain.local", "admin_account_wsus", "Password", LogonType.Batch))
{
ComputerTargetScope scope = new ComputerTargetScope();
IUpdateServer server = AdminProxy.GetUpdateServer("wsus_server.mydomain.local", false, 80);
ComputerTargetCollection targets = server.GetComputerTargets(scope);
// Search
targets = server.SearchComputerTargets("any_server_name_or_ip");
// To get only on server FindTarget method
IComputerTarget target = FindTarget(targets, "any_server_name_or_ip");
Console.WriteLine(target.FullDomainName);
IUpdateSummary summary = target.GetUpdateInstallationSummary();
UpdateScope _updateScope = new UpdateScope();
// See in UpdateInstallationStates all other properties criteria
_updateScope.IncludedInstallationStates = UpdateInstallationStates.Downloaded;
UpdateInstallationInfoCollection updatesInfo = target.GetUpdateInstallationInfoPerUpdate(_updateScope);
int updateCount = updatesInfo.Count;
foreach (IUpdateInstallationInfo updateInfo in updatesInfo)
{
Console.WriteLine(updateInfo.GetUpdate().Title);
}
}
}
public IComputerTarget FindTarget(ComputerTargetCollection coll, string computername)
{
foreach (IComputerTarget target in coll)
{
if (target.FullDomainName.Contains(computername.ToLower()))
return target;
}
return null;
}
}
}
Update: This may not be "Pairing". This may just need to have a service started and bound to a port. However, this code is not storing it either. I need the device to be stored even after the application is closed.
I am building a program specifically suited for Zebra RW 420's on a Windows Mobile 6 Handheld device. The application needs to allow a mobile device to pair with the printer on COM1. I believe I am very close to getting it, but I can't get the pair request to work.
I am able to communicate with the printer and even print by directly connecting and printing, but I can't get the mobile device to actually pair with it. I've tried a variation of pins to include null, "1", "0000", and "1234". No matter what, the method always returns false. Any suggestions or ideas why this might be failing? I can pair the device just find in the WM6 Bluetooth menu, but not in my application.
It might be important to note that the little light bulb icon on the printer comes on when the program says it is attempting to pair, but after about 5 to 10 seconds, it fails.
BluetoothSecurity.PairRequest(device, "1"))
Additional Information:
I've successfully paired with my Android phone using this code.
I then logged in and set a PIN on the Zebra printer. However, this code still fails to pair with the printer even when I know the pin is correct / set in the printer.
From https://km.zebra.com/kb/index?page=answeropen&type=open&searchid=1336682809706&answerid=16777216&iqaction=5&url=https%3A%2F%2Fkm.zebra.com%2Fkb%2Findex%3Fpage%3Dcontent%26id%3DSO8031%26actp%3Dsearch%26viewlocale%3Den_US&highlightinfo=6292341,26,43#
Zebra Bluetooth enabled mobile printers are 'slave' devices only. The printers will pair with any 'master' device that tries to make a valid connection. Since only a master device can initiate a connection, the printer does not store pairing data, that function is always done on the master device. The printer can only be connected to one master device at a time, but any number of master devices that have stored pairing information for the printer would be able to initiate a connection to the printer without having to rediscover it.
I'm guessing that this means the InTheHand.Net BluetoothSecurity.PairRequest might not work for this type of pairing?
In the Bluetooth section of the WM handheld, under the "Devices" tab, I can add the device. I need to essentially do that. I need to register the device in that list and then set it to use COM 1 in the "COM Ports" section. The application I am using doesn't actually print. It's sole purpose is to prepare the printer for other applications.
The quote from Zebra make it sounds as pairing is actually not required at all. Are you printing from your app? If so just connect to the SPP service and send the text.
BluetoothAddress addr = ...
Guid serviceClass;
serviceClass = BluetoothService.SerialPort;
var ep = new BluetoothEndPoint(addr, serviceClass);
var cli = new BluetoothClient();
cli.Connect(ep);
Stream peerStream = cli.GetStream();
peerStream.Write ...
(From General Bluetooth Data Connections)
The Zebra Mobile Printer needed to be properly configured before pairing with this method will work. Here is what I did:
First, I ran the following commands on the printer:
.
! U1 setvar "bluetooth.authentication" "setpin"
! U1 getvar "bluetooth.authentication"
! U1 getvar "bluetooth.enable"
! U1 getvar "bluetooth.discoverable"
! U1 setvar "bluetooth.bluetooth_pin" "0000"
! U1 getvar "bluetooth.bluetooth_pin"
Then, the application with this code ran successfully.
.
int pair_req = 0;
try
{
if (BluetoothSecurity.SetPin(device, "0000")) {
while (status == false && pair_req < 3)
{
++pair_req;
status_box.Text = status_box.Text + '\n' + "Attempt " + pair_req.ToString();
status_box.Update();
if (BluetoothSecurity.PairRequest(device, "0000"))
{
status = true;
client.Refresh();
status_box.Text = "Paired Successfully.";
status_box.Update();
Thread.Sleep(5000);
}
else
{
status = false;
}
}
}
}
catch (ArgumentNullException e)
{
status_box.Text = "Pair failed.";
status_box.Update();
Thread.Sleep(5000);
}
status_box.Update();
Thread.Sleep(400);
To get all avaliable Serialports from the system i use the following command.
SerialPort.GetPortNames
It works fine for the mainboard serial port, but with the bluetooth device i get the wrong portnames.
For Example: Instead of COM7 i get sometimes COM70 or COM7ö. Its always 1 letter to much.
any suggestens?
PS: I am using newest Visual Studio Express in Windows 7
PPS: The dirty hack to cut the last letter didn't work because i don't know which one is the bluetooth serial port (with various bluetoothstick or devices it changes the number of the comport) and after trying various sticks i reached COM10, ergo COM100 or COM10f
EDIT: the code i am using right now. reading the regestry, but still the same problem.
RegistryKey myRegistry = Registry.LocalMachine.OpenSubKey("Hardware\\DeviceMap\\SerialComm");
foreach (string valuename in myRegistry.GetValueNames())
{
if (myRegistry.GetValue(valuename) is String)
{
if (valuename.Contains("BthModem"))
{
richTextBox1.AppendText(">" + myRegistry.GetValue(valuename) + "<" + Environment.NewLine);
}
}
}
Normally the second or third request is working with a result like
COM11ᯋ<
COM10S<
COM11<
COM10<
COM11<
COM10<
how can that be?
This has been reported as a bug with non-null terminated strings:
Can you manually walk the registry?
HKLM\Hardware\DeviceMap\SerialComm
You can utilize WMI to query the system for serial ports, including those that are added by bluetooth devices and USB-To-Serial devices. Maybe that way you won't encounter this issue. See at CodeProject.
I have the same issue. SerialPort.GetPortNames basically uses the registry anyway- both of those methods don't seem to work with bluetooth.
The workaround I'm currently using is to loop through the first X com ports and see if they exist, which is hardly elegant. MS: FAIL.